1. Does not pick up a lot of background noise2. Most of the mics were either too loud or not able to hear and there was not a sweet spot - this one allows for fine tuning3. Very easy set up with the exception that everything is labeled in Chinese - but we were able to figure...
which can either be hum or whir. But if you notice your PTAC heat unit making unusual noise or sounds; such as sounds you have never experienced before there is high tendency that something is wrong somewhere. The kind of unusual sounds you should take note of are knocking, buzzing, bangi...